adding stacker patch

patches/stacker/README.md

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+### Description
+Stacker is a patch that allows moving around the stack more freely. With only
+one keybinding, quickly move, swap and jump around the window stack.
+
+1. Focus any window of the stack with a single key binding.
+2. Swap the currently focused windows with any other window in the stack.
+3. Move the selected window in the stack with `relativeswap`.
+
+This patch is heavily inspired by the original [stacker](https://dwm.suckless.org/patches/stacker/) dwm patch.
+
+### Keybinding
+
+- `MODKEY` + {`q`, `w`, `e`, `r`}: jump to the first, second, third and last
+  window of the stack
+- `MODKEY` + `SHIFT` + {`Q`, `W`, `E`, `R`}: swap the selected with the first, second, third and last
+  window of the stack
+- `MODKEY` + `SHIFT` + {`J`, `K`}: move the selected window up & down the stack
+
+### Missing feature
+
+Jumping to the last selected window is not yet implemented.
+
+### Download
+- [2024-05-17](https://codeberg.org/dwl/dwl-patches/raw/branch/main/patches/stacker/STACKER.patch)
+
+### Authors
+- [jeromecst](https://codeberg.org/jeromecst)